@@ -31,6 +31,7 @@ obj-y += $(KVM)/arm/vgic/vgic-init.o
obj-y += $(KVM)/arm/vgic/vgic-irqfd.o
obj-y += $(KVM)/arm/vgic/vgic-v2.o
obj-y += $(KVM)/arm/vgic/vgic-v3.o
+obj-y += $(KVM)/arm/vgic/vgic-v4.o
obj-y += $(KVM)/arm/vgic/vgic-mmio.o
obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o
obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o
@@ -26,6 +26,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-init.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-irqfd.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-v2.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-v3.o
+kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-v4.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v2.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v3.o
@@ -26,6 +26,8 @@
#include <linux/list.h>
#include <linux/jump_label.h>
+#include <linux/irqchip/arm-gic-v4.h>
+
#define VGIC_V3_MAX_CPUS 255
#define VGIC_V2_MAX_CPUS 8
#define VGIC_NR_IRQS_LEGACY 256
@@ -236,6 +238,15 @@ struct vgic_dist {
/* used by vgic-debug */
struct vgic_state_iter *iter;
+
+ /*
+ * GICv4 ITS per-VM data, containing the IRQ domain, the VPE
+ * array, the property table pointer as well as allocation
+ * data. This essentially ties the Linux IRQ core and ITS
+ * together, and avoids leaking KVM's data structures anywhere
+ * else.
+ */
+ struct its_vm its_vm;
};
struct vgic_v2_cpu_if {
@@ -254,6 +265,14 @@ struct vgic_v3_cpu_if {
u32 vgic_ap0r[4];
u32 vgic_ap1r[4];
u64 vgic_lr[VGIC_V3_MAX_LRS];
+
+ /*
+ * GICv4 ITS per-VPE data, containing the doorbell IRQ, the
+ * pending table pointer, the its_vm pointer and a few other
+ * HW specific things. As for the its_vm structure, this is
+ * linking the Linux IRQ subsystem and the ITS together.
+ */
+ struct its_vpe its_vpe;
};
struct vgic_cpu {
@@ -285,6 +285,12 @@ int vgic_init(struct kvm *kvm)
if (ret)
goto out;
+ if (vgic_supports_direct_msis(kvm)) {
+ ret = vgic_v4_init(kvm);
+ if (ret)
+ goto out;
+ }
+
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_vgic_vcpu_enable(vcpu);
@@ -320,6 +326,9 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
kfree(dist->spis);
dist->nr_spis = 0;
+
+ if (vgic_supports_direct_msis(kvm))
+ vgic_v4_teardown(kvm);
}
void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
@@ -1638,6 +1638,14 @@ static int vgic_its_create(struct kvm_device *dev, u32 type)
if (!its)
return -ENOMEM;
+ if (vgic_initialized(dev->kvm)) {
+ int ret = vgic_v4_init(dev->kvm);
+ if (ret) {
+ kfree(its);
+ return ret;
+ }
+ }
+
mutex_init(&its->its_lock);
mutex_init(&its->cmd_lock);
new file mode 100644
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2017 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/kvm_host.h>
+
+#include "vgic.h"
+
+/**
+ * vgic_v4_init - Initialize the GICv4 data structures
+ * @kvm: Pointer to the VM being initialized
+ *
+ * We may be called each time a vITS is created, or when the
+ * vgic is initialized. This relies on kvm->lock to be
+ * held. In both cases, the number of vcpus should now be
+ * fixed.
+ */
+int vgic_v4_init(struct kvm *kvm)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ struct kvm_vcpu *vcpu;
+ int i, nr_vcpus, ret;
+
+ if (dist->its_vm.vpes)
+ return 0;
+
+ nr_vcpus = atomic_read(&kvm->online_vcpus);
+
+ dist->its_vm.vpes = kzalloc(sizeof(*dist->its_vm.vpes) * nr_vcpus,
+ GFP_KERNEL);
+ if (!dist->its_vm.vpes)
+ return -ENOMEM;
+
+ dist->its_vm.nr_vpes = nr_vcpus;
+
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ dist->its_vm.vpes[i] = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+
+ ret = its_alloc_vcpu_irqs(&dist->its_vm);
+ if (ret < 0) {
+ kvm_err("VPE IRQ allocation failure\n");
+ kfree(dist->its_vm.vpes);
+ dist->its_vm.nr_vpes = 0;
+ dist->its_vm.vpes = NULL;
+ return ret;
+ }
+
+ return ret;
+}
+
+/**
+ * vgic_v4_teardown - Free the GICv4 data structures
+ * @kvm: Pointer to the VM being destroyed
+ *
+ * Relies on kvm->lock to be held.
+ */
+void vgic_v4_teardown(struct kvm *kvm)
+{
+ struct its_vm *its_vm = &kvm->arch.vgic.its_vm;
+
+ if (!its_vm->vpes)
+ return;
+
+ its_free_vcpu_irqs(its_vm);
+ kfree(its_vm->vpes);
+ its_vm->nr_vpes = 0;
+ its_vm->vpes = NULL;
+}
@@ -242,5 +242,7 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
bool vgic_supports_direct_msis(struct kvm *kvm);
+int vgic_v4_init(struct kvm *kvm);
+void vgic_v4_teardown(struct kvm *kvm);
#endif